<div id="lamp-wrapper">
  <div id="move-lamp">
    <p>欢迎访问正式版 \^o^/ </p>
  </div>
</div>

<script type="text/javascript">
  function moveFun() {
    var info = document.querySelector('#move-lamp p');
    info.innerHTML = info.innerHTML.substr(1) + info.innerHTML[0];
  }

  window.onload = function() {
    setInterval(moveFun, 500);
  }
</script>